Receiver for wireless transmission of signals.



V. POULSEN.

RECEIVER FOR WIRELESS TRANSMISSION OF SIGNALS.

APPLICATION FILED SEPT. 16, 1905.

Patented Apr. 22, 1913.

favnlor ML vllty TERRUFTER STATES PATENT OFFICE.

*v'annnu'nn roirnsnn, or. cornivnnonn, nnnmazax.

RECEIVER ,FOR :ESS TRANSMISSION OF. SIGNALS.

\ Specification of Letters Patent.

Patented Apr. 22, 1913.

Application filed September 16, '1905. 1 Serial 110,278,777.

To all whom it may concern:

'Be it known that I', VALDEMAB Pour-SEN, electrical engineer, resident of :Steen Blichersvej 22, Copenhagen, Denmark, have m: vented a new and useful Improvement in Receivers for Wireless Transmlssion of Sigpractice to use in the receiving systema 4coherer or magnetic detector, which is permanent-ly connected in the receivmg clrcuit.

In such a system, however, it is impossible.

to obtain the highest degree of iresonance, since thedampening of the oscillations and the intervals betweenthem tend to revent resonance. In order to obtain the igh est degree of resonance it is desirable to use a transmitter comprising an interrupter of some character that is capable of sending out the waves continuously and uniformly, Such interrupters have been devised, but have not been generally putinto use. In this class of interrupter I may refer to the Wehnelt interrupter, the Cooper Hewitt mercury vapor interrupter, and theDuddell interrupter, described 1n British Patent No. 21,629 of 1900. Transmitters employin interrupters of this character tend to pro uce vibrations in the receiving device of a tuned system, of thehighest amplitude. But in experiments with such apparatus, I have found when the coherer or Wave detector is permanently in circuit with the resonant circuit, that it interferes with the action of the resonance, preventing the circuit from retaining or continuously building up its resonance. This is due to the fact that the resistance of the coherer is not controllable andthe iron of the magnetic detector tends to dampen the vibrations.

The object of the present invention is,

therefore to provide a system in: which by the use of a transmitter capable of sending out continuous waves the highest possible resonance is obtained in the receiver, and is not interfered with by other devices or apparatus forming apart of the tuned 'receiw in% system.

he inventioncomprises means whereby natel the wave detector forming a part of the receiving system. is only intermittently connected with the receivingsystem proper or resonant :circuit, whereby the intervals of disconnection will afiord time for the vibrations -to build up to the highest amplitude undisturbed by the coherer or other wave.

detector. y

In carrying out my invention, a terminal or the terminals of the wave detector, is,-or are,- alternately connected with the resonant circuit, and the relay circuit by means of an ordinary vibrator similar to that used in an electric bell;

Referring to the accompanying drawing, Figures 1 to 6 illustrate diagrammatic examples of the arrangement of a receiving system according to my invention,

The various figures show modifications in the manner of connecting upthe various a paratuses, all covered within the scopeof the invention.

9 indicates the antenna, a the receiving, 0011 or resonance, 2 the earth connection, I

thecoherer or wave indicator or detector, either chemical or any other sort, having the terminals b and c; R the relay in the local circuit, which also includes the battery d.

e and f are respectively terminals of the receiving coil a, and the local or relay circuit R.

The invention comprises means more articularly hereinafter described for a terconnectin one or bothof the terminals and c of t e detector with the receiv- 'ing coil and the local circuit. For instance,

in Fig. 1, the terminal 6 is extended into a vibrating blade which plays between the contacts e. and f. Its motions are made at ap proximately from 8 to 15 vibrations per second depending upon the operation of the .vibrator or circuit controller that is used for the purpose. It is understood that. the vibratlons of the device bare extremely slow in comparison to the vibrations of a wave oscillation circuit, while at the same time extremely fast with respect to signals of.

Morse or other code. The oscillations of a 101i wireless receiving circuit are at the rateof i from. 200,000-300,000 a. second, so that the.

comparison to Morse code signaling that each Morse dash amounts to a very long circuit closure in comparison't'o device I). In

' case a tapper is employed'with a detector having iron filings, the same considerations Fig. 2 1s the sameas Fig. '1, except that a condenser I; is inserted to increase the capacity oi the coil (1.

In, Fig. 3, the vibrations ,in the coil a induce. other vibrations in the coil Z, the structure being a transformer and .a con .denser is being used as before to increase thecapacity. In this arrangement also the terminal 0 of the coherer is intended 'to be connected with'the contact m of the local circuit simultaneously with the connections,

-raise .the potentia'l in a well-known manner,

which in itself forms no part of the present invention.

InFig. 6 the arrangement-is such that the contact 6 with which the indicator I makes claim:

connection can be adjusted to connect with that part of the coil a which-sixnultaneously possesses the maximum. of tension with opposite-signs, and the :coil a can act either inv connection withanantjenna as receiver or be electrically connected to the receiver proper.

The coil aof Fig. 6 constitutes anordinary .autostransformer.

Having thus described invention, I Y

. In a receiver for wireless and a circuit independent 0 said device, means for intermittently disconnecting the wave detector from said device, and a source of I extraneous power for .contmuously operating said means, wherebyflsaid detector is periodically in said circuit independent of said device. i

In testimony whereof I have signed this specification in the presence of two subscribing witnesses. I VALDEMAR roULsEN.

Witnesses: v

J. 'HENN. Cameraman, CEoIL VILHELM ScHoU.

I transmission of. s gnals,- the comblnation of a wave detector,- "a device WhlCh recelvesener from space, 

